Remove utils/utilsModule + utils/helper

https://github.com/alveusgg/chatbot/blob/main/src/utils/utilsModule.js + https://github.com/alveusgg/chatbot/blob/main/src/utils/helper.js are a hodge-podge of random utility methods that could do with being cleaned up with JSDoc added, establishing what is actually being used in multiple places (if used in a single place, can likely be moved in-line rather than a util) and split into dedicated files (one per util, or per grouping of logically-related utils).